JP3417600B2 - Polyamide resin composition - Google Patents
Polyamide resin compositionInfo
- Publication number
- JP3417600B2 JP3417600B2 JP14078293A JP14078293A JP3417600B2 JP 3417600 B2 JP3417600 B2 JP 3417600B2 JP 14078293 A JP14078293 A JP 14078293A JP 14078293 A JP14078293 A JP 14078293A JP 3417600 B2 JP3417600 B2 JP 3417600B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- parts
- polyamide resin
- resin composition
- density polyethylene
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/08—Copolymers of styrene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/08—Copolymers of styrene
- C08L25/10—Copolymers of styrene with conjugated dienes
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、摺動部品用ポリアミド
樹脂組成物に関し、さらに詳しくは、すべり摩擦係数が
低く、ざらつき摩耗量が少なく、繰り返し疲労による性
能低下の少ない摺動部品を提供し得るような、強化ポリ
アミド樹脂組成物に関する。
【０００２】
【従来の技術】ポリアミドは機械特性、耐摩耗性に優れ
ているため、ギア、カム軸受などの摺動部品に広く用い
られている。この種の用途に使用されるプラスチック材
料については、
すべり摩擦係数が低いこと
ざらつき摩耗量の少ないこと
繰り返し疲労等の連続荷重に耐える疲労限界が高いと
いう機械特性に優れたものであること
軟化温度が高いこと
成形が容易であること
を満たすことが必要とされる。
【０００３】しかしながら、従来用いられているポリア
ミド樹脂等は上記のような特性を充分に備えておらず、
特にざらつき摩耗量を低く抑えることができない上、繰
り返し疲労等の連続荷重に耐える疲労限界が充分でない
という問題があった。
【０００４】このため、ポリアミド樹脂については、そ
の摩擦係数を下げる目的で、テフロン樹脂、シリコンオ
イル、鉱物油、高密度ポリエチレン等を混入したものが
市販されているが、これらの添加剤はポリアミド樹脂と
は相溶しないか、界面接着しないため、依然としてざら
つき摩耗量が多く、繰り返し疲労等の連続荷重に耐える
疲労限界も不充分である。
【０００５】一方、他のポリアミド樹脂組成物としてエ
チレン／プロピレン／１，４−ヘキサジエンおよびエチ
レン／無水マレイン酸の混合物をポリアミド樹脂に添加
したもの（特開昭５１−１４３０６１号）が提案されて
おり、耐衝撃性の向上によって繰り返し疲労等の連続荷
重に耐える疲労限度は多少向上するが、ざらつき摩耗量
は低減されていない。
【０００６】
【発明が解決しようとする課題】本発明は上記従来技術
の問題を解決し、すべり摩擦係数、ざらつき摩耗量が低
く、かつ繰り返し疲労等の連続荷重に対する疲労限界が
充分に高い成形品を与え得るポリアミド樹脂組成物を提
供することを目的とする。
【０００７】
【課題を解決するための手段】前記課題を解決すること
のできた本発明は、ポリアミド樹脂組成物が、（Ａ）ポ
リアミド樹脂８５〜９５重量部および（Ｂ）ワラストナ
イト５〜１５重量部の合計１００重量部に対して、
（Ｃ）不飽和カルボン酸および／または不飽和ジカルボ
ン酸無水物で変性された変性スチレン系共重合体が１〜
３０重量部と、（Ｄ）不飽和カルボン酸および／または
不飽和ジカルボン酸無水物で変性された重量平均分子量
５〜４０万の変性高密度ポリエチレンが０．５〜１０重
量部含有されたものであるところに要旨を有する。
【０００８】
【作用】本発明では、ポリアミド樹脂として公知のナイ
ロン６，６６，６１０，１１，１２等のポリアミドの１
種類以上を非限定的に用いることができ、その適正使用
量は８５〜９５重量部である。また、本発明において用
いられる（Ｂ）ワラストナイトは、無機充填剤であり、
一般市販のものを使用することができる。ワラストナイ
トの好ましい使用量は５〜１５重量部であり、上記ポリ
アミドとの合計を１００重量部とする。ワラストナイト
が５重量部未満のときは、機械的性質および熱的性質が
不充分となり、一方１５重量部を超えると、表面の良好
な成形品が得難く、耐摩耗性が損なわれる。より好まし
い使用量は、５〜１０重量部である。
【０００９】本発明のポリアミド樹脂組成物には、上記
ポリアミドとワラストナイトの他に不飽和カルボン酸お
よび／または不飽和ジカルボン酸無水物で変性された変
性スチレン系共重合体（Ｃ）と変性高密度ポリエチレン
（Ｄ）が必須の構成成分として含まれる。これらの成分
は、摩擦特性および疲労限界の向上に寄与する。
【００１０】スチレン系共重合体とは、公知のＳ（スチ
レン）−Ｂ（ブタジエン）−Ｓ型の対称ブロック型構造
をしたスチレンブロックコポリマーである。ＳおよびＢ
はそれぞれ重合体ブロックを示し、中心ブロックＢは、
ポリイソプレンでもかまわないが、ポリブタジエンが好
ましい。また、水素添加によって、ポリブタジエン中の
二重結合の一部を飽和アルキル基（エチレン鎖）にした
もの（ＳＥＢＳ）が推奨される。両末端ブロックＳは、
芳香族炭化水素の重合体ブロックを示し、好適にはポリ
スチレンからなるブロックである。末端ブロックＳの分
子量は４０００〜１１５０００、より好ましくは５００
０〜１５０００、中心ブロックＢの分子量は２００００
〜４５００００、より好ましくは２５０００〜１０００
００であることが望ましい。
【００１１】このような水素添加スチレン系ブロック共
重合体は、容易に市場で入手でき、例えばシエル化学よ
り「クレイトンＧ１６５０」、「クレイトンＧ１６５
１」、「クレイトンＧ１６５７」等の商品名およびグレ
ード名で市販されている。
【００１２】本発明における変性前の高密度ポリエチレ
ンとは、分子量が５〜４０万、密度０．９４ｋｇ／ｃｍ
2 以上の高密度ポリエチレンを意味する。分子量が５万
未満では、得られる成形品の耐摩耗性が不充分となり、
分子量が４０万を超えると成形が困難になるため好まし
くない。本発明において用いられる高密度ポリエチレン
は、その性質を損なわない範囲内で他のモノマー、例え
ばプロピレン、ブテン−１、ペンテン、４−メチルペン
テン−１、ヘキセン、オクテン、デセン等のα−オレフ
ィン類、ブタジエン、イソプレン等のジエン類、シクロ
ペンテン、シクロヘキセン、シクロペンタジエン等のシ
クロオレフィン類、メチルアクリレート、エチルアクリ
レート、ブチルアクリレート等のアクリレート類が共重
合されていてもよい。
【００１３】これらのスチレン系共重合体および高密度
ポリエチレンを変性させるための不飽和カルボン酸また
は不飽和ジカルボン酸無水物としては、例えばアクリル
酸、メタクリル酸、クロトン酸、オレイン酸等の不飽和
カルボン酸や、無水マレイン酸、無水イタコン酸、無水
シトラコン酸等の不飽和ジカルボン酸が挙げられ、これ
らのうち１種以上を用いることができる。特に無水マレ
イン酸が好ましい。
【００１４】前記スチレン系共重合体または高密度ポリ
エチレンと不飽和カルボン酸無水物または不飽和カルボ
ン酸との変性反応は、ラジカル発生用の過酸化物の存在
下に、スチレン系共重合体または高密度ポリエチレンと
上記不飽和ジカルボン酸無水物または不飽和カルボン酸
とを混合し、押出機、ミキサー等で１００〜２５０℃で
１〜１０分混練することによって行なうことができる。
不飽和カルボン酸無水物または不飽和カルボン酸の量
は、スチレン系共重合体または高密度ポリエチレンに対
して、０．１〜５重量部が好ましい。
【００１５】変性スチレン系共重合体（Ｃ）は、（Ａ）
ポリアミド樹脂と（Ｂ）ワラストナイトの合計１００重
量部に対して、３〜１０重量部配合される。３重量部未
満の場合、繰り返し疲労性の改善が見られず、１０重量
部より多いと、ざらつき摩耗量が多くなる。また、変性
高密度ポリエチレン（Ｄ）の配合量は上記（Ａ）＋
（Ｂ）＝１００重量部に対して０．５〜５重量部とす
る。０．５重量部未満の場合は、成形品の耐摩耗性が不
充分であり、含有量が５重量部を超えると成形品の剛性
等の力学的性質が低下すると共に耐熱性も低下するため
好ましくない。
【００１６】本発明の樹脂組成物においては、成形品と
した場合の摺動特性、すなわち摩擦・摩耗特性のより一
層の改良のために、上記４成分の他に炭素繊維、フッ素
樹脂粉末、二硫化モリブデン、ガラスビーズ等の添加剤
を添加することができる。また、成形品の力学的性質、
電気的性質等の改良のために、炭素カルシウム、硫酸バ
リウム等の充填材、チタン酸カリウム等のウイスカー、
カーボンブラック、金属粉末等の導電性改良充填材を樹
脂成形品の摺動特性を損なわない範囲内において添加す
ることができる。さらに、酸素、熱、紫外線等に対する
劣化防止剤や、安定剤、滑剤、可塑剤、難燃剤、帯電防
止剤、着色剤、離型剤等を樹脂成形品の摺動特性を損な
わない範囲内において添加してもよい。
【００１７】本発明における樹脂組成物は、各成分を単
軸押出機、二軸押出機、ニーダー、二軸ロール等の装置
を用いて混練することにより製造される。用いられる混
練機の種類や混練条件についての制限は特にない。
【００１８】
【実施例】以下本発明を実施例を用いて具体的に説明す
るが、本発明はこれらの実施例に限定されるものではな
い。なお、以下の各例において得られたポリアミド樹脂
成形品の各物性は下記の試験方法に基づいて測定した。
【００１９】耐すべり摩擦性：鈴木式スラスト摩耗試験
機を使用し、相手材としてＳ−４５Ｃ鋼（摩擦面積１．
６ｃｍ2 ）を用い、摩擦速度１０ｃｍ／ｓ，荷重４０ｋ
ｇ／ｃｍ2 の条件で１時間連続運転した時の摩擦係数μ
を求めた。
耐ザラツキ摩耗性：テーバーマモウ試験機を使用し、摩
耗輪としてはＨ−１８を用い、１０００回転後の樹脂成
形品の摩耗量ｍｇを求めた。
【００２０】繰り返し疲労性：図１に示す屈曲疲労試験
機を作成し、試料である樹脂成形品（１０ｍｍ幅で１ｍ
ｍ厚）の外観に異常（シワ、白化、クラック等）が発生
するまでのサイクル数を測定した。チャック間ストロー
クは６８ｍｍである（最大７０ｍｍ，最小２ｍｍ）。
【００２１】実施例１〜３，比較例１〜６
ポリアミド樹脂としてナイロン６（Ｒ，Ｖ＝２．５）
を、変性前スチレン系共重合体としてはＳＥＢＳ（クレ
イトンＧ１６５７，シエル化学製）を、また、変性前高
密度ポリエチレンとしては重量平均分子量が４．５万、
１４万および１００万のポリエチレン（ハイゼックス、
三井石油化学）を使用した。スチレン系共重合体および
高密度ポリエチレンの変性は、過酸化物として２，５−
ジメチル−２，５−ジ（ｔ−ブチルパーオキシ）ヘキサ
ン（パーヘキシン２５Ｂ，日本油脂製）０．３重量％と
無水マレイン酸１重量％を加え、２４０℃×３分間溶融
混合して行ない、マレイン酸が０．５重量％グラフトし
た変性体を得た。
【００２２】表１、２に示したそれぞれの成分の所定量
を、３０ｍｍ２軸押出機を用いてブレンドしてペレット
を製造した。シリンダー温度は２６５℃とした。得られ
たペレットは７０℃で１６時間真空乾燥した。このペレ
ットを、シリンダー温度２６５℃，金型温度８０℃に調
整された射出成形機によりテストピースを成形し、評価
結果を表１、２に併記した。
【００２３】
【表１】【００２４】
【表２】【００２５】
【発明の効果】本発明のポリアミド樹脂組成物は、すべ
り摩擦係数が低く、ざらつき摩耗量が少なく、繰り返し
疲労による性能低下が少ないので、ギア、カム、軸受な
どの動的用途を目的とする成形用材料として非常に有用
である。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyamide resin composition for sliding parts, and more particularly to a polyamide resin composition having a low coefficient of sliding friction, a small amount of rough wear, and repeated fatigue. The present invention relates to a reinforced polyamide resin composition that can provide a sliding part with less performance degradation. [0002] Polyamide is widely used for sliding parts such as gears and cam bearings because of its excellent mechanical properties and wear resistance. The plastic materials used for this type of application must have low mechanical friction such as low sliding friction coefficient, low roughness, and high fatigue limit to withstand continuous loads such as repeated fatigue. It is necessary to satisfy that it is expensive and easy to mold. However, conventionally used polyamide resins and the like do not have the above-mentioned properties sufficiently,
In particular, there has been a problem that the amount of rough wear cannot be suppressed to a low level and the fatigue limit for withstanding a continuous load such as repeated fatigue is not sufficient. For this reason, polyamide resins mixed with Teflon resin, silicone oil, mineral oil, high-density polyethylene and the like are commercially available for the purpose of lowering the friction coefficient. These additives are polyamide resins. Is not compatible with or does not adhere to the interface, so that the roughness is still large, and the fatigue limit to withstand continuous load such as repeated fatigue is insufficient. On the other hand, another polyamide resin composition in which a mixture of ethylene / propylene / 1,4-hexadiene and ethylene / maleic anhydride is added to a polyamide resin has been proposed (JP-A-51-143061). Although the fatigue limit for withstanding continuous loads such as repeated fatigue is slightly improved by the improvement of impact resistance, the amount of rough wear is not reduced. SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and provides a molded article having a low coefficient of sliding friction, a low amount of rough wear, and a sufficiently high fatigue limit for continuous loads such as repeated fatigue. It is an object of the present invention to provide a polyamide resin composition capable of providing the following. According to the present invention, which can solve the above-mentioned problems, the polyamide resin composition comprises (A) 85 to 95 parts by weight of a polyamide resin and (B) 5 to 15 parts of wollastonite. For a total of 100 parts by weight,
(C) a modified styrene copolymer modified with an unsaturated carboxylic acid and / or an unsaturated dicarboxylic anhydride is 1 to
30 parts by weight and (D) 0.5 to 10 parts by weight of a modified high-density polyethylene modified with an unsaturated carboxylic acid and / or an unsaturated dicarboxylic anhydride and having a weight average molecular weight of 50,000 to 400,000. It has a gist somewhere. According to the present invention, a polyamide resin such as nylon 6,66,610,11,12 or the like, which is known as a polyamide resin, is used.
More than one kind can be used without limitation, and the proper use amount is 85 to 95 parts by weight. Further, (B) wollastonite used in the present invention is an inorganic filler,
General commercial products can be used. The preferred amount of wollastonite is 5 to 15 parts by weight, and the total amount of the wollastonite and the polyamide is 100 parts by weight. When the wollastonite is less than 5 parts by weight, the mechanical properties and the thermal properties become insufficient. On the other hand, when it exceeds 15 parts by weight, it is difficult to obtain a molded article having a good surface and the wear resistance is impaired. A more preferred amount is 5 to 10 parts by weight. The polyamide resin composition of the present invention comprises, in addition to the polyamide and wollastonite, a modified styrene copolymer (C) modified with an unsaturated carboxylic acid and / or an unsaturated dicarboxylic anhydride. High density polyethylene (D) is included as an essential component. These components contribute to the improvement of friction characteristics and fatigue limit. The styrene copolymer is a known styrene block copolymer having a symmetric block type structure of S (styrene) -B (butadiene) -S type. S and B
Each represents a polymer block, and the central block B is
Polyisoprene may be used, but polybutadiene is preferred. In addition, it is recommended that some of the double bonds in polybutadiene be converted to saturated alkyl groups (ethylene chains) by hydrogenation (SEBS). Both end blocks S are
It shows a polymer block of an aromatic hydrocarbon, preferably a block made of polystyrene. The molecular weight of the terminal block S is 4000 to 115000, more preferably 500
0-15000, molecular weight of central block B is 20,000
~ 450,000, more preferably 25,000-1000
00 is desirable. [0011] Such hydrogenated styrene-based block copolymers are readily available on the market. For example, "Clayton G1650" and "Clayton G165" are available from Shell Chemical.
1 and Clayton G1657. The high-density polyethylene before modification in the present invention is defined as having a molecular weight of 50,000 to 400,000 and a density of 0.94 kg / cm.
Means two or more high density polyethylene. If the molecular weight is less than 50,000, the resulting molded article will have insufficient abrasion resistance,
If the molecular weight exceeds 400,000, molding becomes difficult, which is not preferable. The high-density polyethylene used in the present invention may contain other monomers, for example, α-olefins such as propylene, butene-1, pentene, 4-methylpentene-1, hexene, octene, and decene, as long as the properties are not impaired. Dienes such as butadiene and isoprene, cycloolefins such as cyclopentene, cyclohexene and cyclopentadiene, and acrylates such as methyl acrylate, ethyl acrylate and butyl acrylate may be copolymerized. Examples of the unsaturated carboxylic acid or unsaturated dicarboxylic anhydride for modifying these styrenic copolymers and high-density polyethylene include unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid and oleic acid. Examples include acids and unsaturated dicarboxylic acids such as maleic anhydride, itaconic anhydride and citraconic anhydride, and one or more of these can be used. Particularly, maleic anhydride is preferred. The modification reaction between the styrenic copolymer or high-density polyethylene and the unsaturated carboxylic anhydride or unsaturated carboxylic acid is carried out in the presence of a radical-generating peroxide in the presence of a styrenic copolymer or a high-density polyethylene. It can be carried out by mixing high-density polyethylene with the above-mentioned unsaturated dicarboxylic anhydride or unsaturated carboxylic acid, and kneading the mixture at 100 to 250 ° C. for 1 to 10 minutes with an extruder, a mixer or the like.
The amount of the unsaturated carboxylic anhydride or unsaturated carboxylic acid is preferably from 0.1 to 5 parts by weight based on the styrene-based copolymer or the high-density polyethylene. The modified styrenic copolymer (C) comprises (A)
It is blended in an amount of 3 to 10 parts by weight based on 100 parts by weight in total of the polyamide resin and (B) wollastonite. If the amount is less than 3 parts by weight, no improvement in repetitive fatigue is observed. If the amount is more than 10 parts by weight, the amount of rough wear increases. The amount of the modified high-density polyethylene (D) is (A) +
(B) = 0.5 to 5 parts by weight for 100 parts by weight. If the amount is less than 0.5 part by weight, the wear resistance of the molded article is insufficient, and if the content exceeds 5 parts by weight, the mechanical properties such as the rigidity of the molded article decrease and the heat resistance also decreases. Not preferred. In the resin composition of the present invention, in addition to the above four components, carbon fiber, a fluororesin powder, Additives such as molybdenum sulfide and glass beads can be added. Also, the mechanical properties of molded products,
Fillers such as calcium calcium and barium sulfate, whiskers such as potassium titanate,
A conductivity improving filler such as carbon black or metal powder can be added within a range that does not impair the sliding characteristics of the resin molded product. Further, a deterioration inhibitor for oxygen, heat, ultraviolet rays, etc., a stabilizer, a lubricant, a plasticizer, a flame retardant, an antistatic agent, a coloring agent, a release agent, etc., within a range that does not impair the sliding characteristics of the resin molded product. It may be added. The resin composition of the present invention is produced by kneading the components using a single-screw extruder, a twin-screw extruder, a kneader, a twin-screw roll or the like. There is no particular limitation on the type of kneader used and the kneading conditions. EXAMPLES The present invention will now be described specifically with reference to examples, but the present invention is not limited to these examples. In addition, each physical property of the polyamide resin molded article obtained in each of the following examples was measured based on the following test methods. Slip friction resistance: S-45C steel (friction area 1.
6cm 2 ), friction speed 10cm / s, load 40k
g / cm 2 for one hour of continuous operation
I asked. Roughness abrasion resistance: Using a Taber Mammou tester, H-18 was used as a wear wheel, and the wear amount mg of the resin molded product after 1,000 rotations was determined. Cyclic fatigue property: A bending fatigue tester shown in FIG. 1 was prepared, and a resin molded product (1 m in width of 10 mm) was prepared as a sample.
The number of cycles until abnormalities (wrinkles, whitening, cracks, etc.) occur in the appearance of the sheet (m thickness) was measured. The stroke between the chucks is 68 mm (maximum 70 mm, minimum 2 mm). Examples 1-3, Comparative Examples 1-6 Nylon 6 (R, V = 2.5) as polyamide resin
As a styrene copolymer before modification, SEBS (Clayton G1657, manufactured by Shell Chemical), a high-density polyethylene before modification with a weight average molecular weight of 45,000,
140,000 and 1 million polyethylene (HIZEX,
(Mitsui Petrochemical) was used. Modification of the styrene-based copolymer and high-density polyethylene is performed by using 2,5-
Add 0.3% by weight of dimethyl-2,5-di (t-butylperoxy) hexane (Perhexin 25B, manufactured by NOF Corporation) and 1% by weight of maleic anhydride, melt and mix at 240 ° C. for 3 minutes. A modified product in which 0.5% by weight of the acid was grafted was obtained. Predetermined amounts of the respective components shown in Tables 1 and 2 were blended using a 30 mm twin screw extruder to produce pellets. The cylinder temperature was 265 ° C. The obtained pellet was vacuum dried at 70 ° C. for 16 hours. Test pieces were molded from the pellets using an injection molding machine adjusted to a cylinder temperature of 265 ° C. and a mold temperature of 80 ° C. The evaluation results are shown in Tables 1 and 2. [Table 1] [Table 2] The polyamide resin composition of the present invention has a low coefficient of sliding friction, a small amount of rough wear, and a small decrease in performance due to repeated fatigue, and is intended for dynamic applications such as gears, cams and bearings. It is very useful as a molding material.
【図面の簡単な説明】
【図１】繰り返し疲労特性を評価するための測定装置の
概略説明図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic explanatory view of a measuring device for evaluating repeated fatigue characteristics.
フロントページの続き (72)発明者 林 稔 愛知県刈谷市朝日町二丁目一番地 アイ シン精機株式会社内 (72)発明者 中井 清隆 愛知県刈谷市朝日町二丁目一番地 アイ シン精機株式会社内 (56)参考文献 特開 昭63−89550（ＪＰ，Ａ) 特開 平３−146553（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C08L 77/00 - 77/12 C08K 3/00 Continuing on the front page (72) Inventor Minoru Hayashi Aichi Shin Seiki Co., Ltd., 2-chome, Asahi-cho, Kariya City, Aichi Prefecture (72) Inventor Kiyotaka Nakai Ichi Seiki Co., Ltd., 2-chome, Asahi-cho, Kariya City, Aichi Prefecture (56) References JP-A-63-89550 (JP, A) JP-A-3-146553 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C08L 77/00-77 / 12 C08K 3/00
Claims (1)
および（Ｂ）ワラストナイト５〜１５重量部の合計１０
０重量部に対して、（Ｃ）不飽和カルボン酸および／ま
たは不飽和ジカルボン酸無水物で変性された変性スチレ
ン系共重合体３〜１０重量部、および（Ｄ）不飽和カル
ボン酸および／または不飽和ジカルボン酸無水物で変性
された重量平均分子量５〜４０万の変性高密度ポリエチ
レン０．５〜５重量部が含有されていることを特徴とす
るポリアミド樹脂組成物。(57) [Claims 1] (A) 85 to 95 parts by weight of a polyamide resin and (B) 5 to 15 parts by weight of wollastonite for a total of 10 parts.
(C) 3 to 10 parts by weight of a modified styrene copolymer modified with an unsaturated carboxylic acid and / or an unsaturated dicarboxylic anhydride, and (D) an unsaturated carboxylic acid and / or A polyamide resin composition comprising 0.5 to 5 parts by weight of a modified high-density polyethylene modified with an unsaturated dicarboxylic anhydride and having a weight average molecular weight of 50,000 to 400,000.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14078293A JP3417600B2 (en) | 1993-06-11 | 1993-06-11 | Polyamide resin composition |
| US08/257,563 US5583177A (en) | 1993-06-11 | 1994-06-10 | Polyamide resin composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14078293A JP3417600B2 (en) | 1993-06-11 | 1993-06-11 | Polyamide resin composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06345961A JPH06345961A (en) | 1994-12-20 |
| JP3417600B2 true JP3417600B2 (en) | 2003-06-16 |
Family
ID=15276623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14078293A Expired - Fee Related JP3417600B2 (en) | 1993-06-11 | 1993-06-11 | Polyamide resin composition |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US5583177A (en) |
| JP (1) | JP3417600B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7521500B2 (en) | 2004-11-24 | 2009-04-21 | Aisin Seiki Kabushiki Kaisha | Sliding parts |
| US11667789B2 (en) | 2019-09-12 | 2023-06-06 | Toyobo Co., Ltd. | Polyamide resin composition and polyamide resin molded article |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3591600B2 (en) * | 1994-12-12 | 2004-11-24 | 東洋紡績株式会社 | Polyamide resin molding |
| US6062271A (en) * | 1998-05-22 | 2000-05-16 | Markel Corporation | Polymethylpentene cable liner |
| EP1200523A1 (en) * | 1999-08-02 | 2002-05-02 | E.I. Du Pont De Nemours And Company | Polyamide compositions for molding |
| KR20070046797A (en) * | 2004-07-01 | 2007-05-03 | 솔베이 어드밴스트 폴리머스 엘.엘.씨. | Aromatic Polyamide Compositions and Products Made therefrom |
| US8686082B2 (en) | 2006-03-24 | 2014-04-01 | Applied Nanotech Holdings, Inc. | Nylon based composites |
| US20070225426A1 (en) * | 2006-03-24 | 2007-09-27 | Nano-Proprietary, Inc. | Nylon 11/Filler/Modifier Composites |
| WO2008075699A1 (en) * | 2006-12-20 | 2008-06-26 | Toyo Boseki Kabushiki Kaisha | Crystalline polyamide based resin composition |
| CN102634203A (en) * | 2012-04-27 | 2012-08-15 | 常熟市发东塑业有限公司 | Preparation method of cold-resistant nylon composite material |
| JP7762649B2 (en) | 2020-04-21 | 2025-10-30 | オイレス工業株式会社 | Polyamide resin composition and sliding member |
| JP7808427B2 (en) | 2020-04-21 | 2026-01-29 | オイレス工業株式会社 | Resin composition for sliding member and sliding member |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61204263A (en) * | 1985-03-08 | 1986-09-10 | Asahi Chem Ind Co Ltd | Thermoplastic resin composition having excellent oil-resistance and heat-resistance |
| JPS63310452A (en) * | 1987-06-10 | 1988-12-19 | Ricoh Co Ltd | Paper overflow processing method for printers, etc. |
| US5089353A (en) * | 1988-10-14 | 1992-02-18 | Kuraray Co., Ltd. | Multi-layer material having gas barrier properties |
| JP2715499B2 (en) * | 1988-12-15 | 1998-02-18 | 住友化学工業株式会社 | Thermoplastic resin composition |
| US5166237A (en) * | 1989-04-20 | 1992-11-24 | Sumitomo Chemical Company, Ltd. | Thermoplastic resin composition |
| US5387645A (en) * | 1990-09-20 | 1995-02-07 | Amoco Corporation | Polyphthalamide composition |
-
1993
- 1993-06-11 JP JP14078293A patent/JP3417600B2/en not_active Expired - Fee Related
-
1994
- 1994-06-10 US US08/257,563 patent/US5583177A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7521500B2 (en) | 2004-11-24 | 2009-04-21 | Aisin Seiki Kabushiki Kaisha | Sliding parts |
| US11667789B2 (en) | 2019-09-12 | 2023-06-06 | Toyobo Co., Ltd. | Polyamide resin composition and polyamide resin molded article |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06345961A (en) | 1994-12-20 |
| US5583177A (en) | 1996-12-10 |
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